Hi
I know I am going against standard calculations and the correct way. But I am in hurry to set up a 12V UPS supply for my wifi router. I am hosting a meeting online and my internet should not be interrupted. So as a quick setup, I am planning to use this type of arrangement. Since the supply is 15V regulated SMPS, I thought a resistor acts as a good current limiter for the battery. However I am not good at designing circuits. The 12V router can get 13.2V in some condition through my circuit. To stop reaching 13.2V to the router, through R1 and battery, I will add another diode at the output of the battery. So please suggest me if making a great mistake.
I know I am going against standard calculations and the correct way. But I am in hurry to set up a 12V UPS supply for my wifi router. I am hosting a meeting online and my internet should not be interrupted. So as a quick setup, I am planning to use this type of arrangement. Since the supply is 15V regulated SMPS, I thought a resistor acts as a good current limiter for the battery. However I am not good at designing circuits. The 12V router can get 13.2V in some condition through my circuit. To stop reaching 13.2V to the router, through R1 and battery, I will add another diode at the output of the battery. So please suggest me if making a great mistake.
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